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Do not modify alpha in split()

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When calling split or we immediately return because unable to
find available slaves, or we start searching on _all_ the moves
of the node or until a cut-off occurs, so that when returning
from split we immediately leave the moves loop.

Because of this we don't need to change alpha inside split() and
we can use a signature similar to search() so to better clarify
that split() is actually a search on the remaining node's moves.

No functional change with faked split.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-08-07 09:24:40 +01:00
parent 9a542d9698
commit 5b35c149e8
3 changed files with 20 additions and 22 deletions
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4
src/thread.h
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@@ -115,8 +115,8 @@ public:
void idle_loop(int threadID, SplitPoint* sp);
template <bool Fake>
void split(Position& pos, SearchStack* ss, Value* alpha, const Value beta, Value* bestValue,
Depth depth, Move threatMove, int moveCount, MovePicker* mp, int nodeType);
Value split(Position& pos, SearchStack* ss, Value alpha, Value beta, Value bestValue,
Depth depth, Move threatMove, int moveCount, MovePicker* mp, int nodeType);
private:
Thread threads[MAX_THREADS];
Lock threadsLock;